Best selling lightweight drink backpack water bag backpack hydration system DHP-017 Black Pattern Type: Thread Lining Material: Cotton Main Material: Polyester Style: hiking/running/climbing/camping and outdoor sports, popular and hot selling Place of Origin: Fujian, China Brand Name: hydration backpack Model Number: polyester backpack Capacity: 10L and customized volume Type: Softback Product Name: hydration bladder backpack Item: hydration pack Color: Grey, white, black, red, blue, green ect. Material: Polyester volume: 10L and can be customized Strap length: adjustable Packing: soft packing Logo: Can be done feature: hydration pack for daily use Use: camping, hiking, boating, swimming, outdoors and more